| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylindrical impeller in which difference in blasting efficiency due to difference of cross sectional shapes between the root of a blade and the tip thereof, which is generated by draft, is diminished, and also a rasping noise is eliminated. SOLUTION: In a blasting cylindrical impeller in which many blades 3 extended along an axial direction are circumferentially formed on the end surface of a supporting plate at predetermined intervals, a mounting angle of rake against the radial direction of the cylindrical impeller of each blade 3 is gradually changed from θ1 to θ2 from a root 11 to a tip 12, so that difference in blasting efficiency due to difference of cross sectional shapes between the roots 11 of the blades 3 and the tips 12 thereof by draft, is diminished. Also, a ridge line 13 on the peripheral side of each blade 3 is made to have physical relationship that is not to be changed in a straight line, but gradually changed while constantly keeping an interval against the stabilizer 6 of a casing, so that wind is smoothly changed to be led to flow into and out from the blades 3, and an nz sound (rasping noise) is eliminated. |
